diff --git a/Dockerfile b/Dockerfile
index 53c080d..f61de2c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # base image
-FROM debian:11.6-slim
+FROM debian:bullseye-20231218-slim
 
 # label with HEAD commit if given
 ARG GIT_COMMIT=unspecified